Convert TOML to JSON and Validate Online
Convert TOML to JSON and check its validity, right in your browser.
🔒 100% client-side — no data sent
Convert a TOML file to JSON and check its validity in an instant. Parsing and conversion happen 100% in your browser, with no data sent anywhere. Ideal for inspecting a Cargo.toml, a pyproject.toml or any TOML config file.
What is it for?
- ▸ Convert a Cargo.toml or pyproject.toml to JSON
- ▸ Validate the syntax of a TOML config file
- ▸ Compare a TOML config with its JSON equivalent
- ▸ Load TOML settings into a tool that reads JSON
FAQ
How do I know if my TOML file is valid?
The tool parses your TOML and reports any syntax error (duplicate key, unclosed table, wrong type). If the file is valid, it outputs the matching JSON directly; otherwise the error message points to the line to fix.
Does my TOML data stay private?
Yes. Conversion and validation run entirely in your browser. No file is uploaded, so you can safely process configs that contain secrets or internal settings.
How are TOML dates and types converted to JSON?
TOML types (strings, integers, booleans, arrays, tables) are mapped to their JSON equivalents. Dates, which JSON lacks natively, are usually represented as ISO 8601 strings to preserve the information.